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Trigonometry Bits and Pieces Senior 3 Accelerated Bearings and Trig. Remember that a bearing is an angle, that is measured FROM NORTH in a CLOCKWISE direction. Bearings Question Town A is 20km north of Town B and Town C is 45km west of Town B. What is the bearing of A from C? Angles of Elevation & Depression An angle of elevation is a rising angle taken from a horizontal line. An angle of depression is a lowering angle taken from a horizontal line. Angle of Elevation Question The angle of elevation from a buoy in the sea to the base of a lighthouse on top of a cliff is 25o. If the buoy is 750m out from the base of the cliff, work out the height of the cliff. Angle of Depression Question Two hot air balloons are connected by a rope 12 m long. One balloon is 3m higher from the ground than the other. Work out the angle of depression from the higher balloon to the lower balloon. Two special triangles Finding the distance between two points. How can we work out the shortest distance from (2,3) and (5,7)?